quiz 14 Flashcards
Which types of metals can be extracted from their oxides by reduction with carbon?
Metals less reactive than carbon
How can metals be placed in order of their reactivity ?
Add each metal to water or acid
observe which metals react the most(by the amount of fizzing)
Define oxidation in terms of loss and gain of oxygen
oxidation is the gain of oxygen
Which types of metals cannot be extracted from their oxides by reduction with carbon?
Metals more reactive than carbon
Define reactivity series
A list of elements ordered by their reactivity
Name the process used to extract metals more reactive than carbon
Electrolysis
Explain why gold and silver can be found as the metals themselves in the earths crust
They are very unreactive
Define oxidation in terms of loss and gain of electrons
oxidation is the loss of electrons
Explain why some metals are more reactive than others
They lose electrons more easily
Define reduction in terms of the loss and gain of oxygen
Reduction is the loss of oxygen
Define reduction in terms of loss and gain of electrons
Reduction is the gain of electrons
State what is formed when a metal reacts with oxygen
a metal oxide
Name 2 metals found as the metals themselves in the earths crust
Gold and silver
A student is investigating the temperature change when a metal is added to a range of acids. Name the independent variable
The acid
When measuring the temperature of a reaction, explain why a polystyrene cup is better than a glass beaker
polystyrene is a good thermal insulator, so it minimises the thermal energy to and from the surroundings
A student is investigating the temperature change when a range of different metal are added to acid. Name the independent variable
The metal
A student is investigating the temperature change when a range of different metals are added to acid. Name the dependent variable
The temperature change
A student is investigating the temperature change when a metal is added to a range of acids. Name the dependent variable
The temperature change
A student has 3 different metals. They want to investigate how the different types of metals cause a different temperature change when added to an acid. outline a method to do this. Ensure a method leads to a valid conclusion
Measure a specific mass of the first metal
use a measuring cylinder to measure a set volume of acid and pour it into a polystyrene cup
Measure the temperature of the acid
Add the first metal to the acid
Measure the highest temperature reached by the acid
Repeat the experiment with the other two metals
Ensure that the following variables are kept constant: mass of metal,particle size of metal,type of acid,volume of acid and concentration of acid
A student is adding ammonium chloride to water, creating an endothermic reaction. They want to know how the mass of the ammonium chloride added affects the temperature change. outline a method to do this. Ensure the method that leads to a valid conclusion
Measure a specific mass of ammonium chloride
use a measuring cylinder to measure a set volume of water and pour into a polystyrene cup
Measure the temperature of the water
Add the ammonium chloride to the water
Measure the highest temperature reached by the water
Repeat the experiment with other masses of ammonium chloride
Ensure that the following variables are kept constant: volume of water, particle size if ammonium chloride, source of water
